I have my suspicions that it may possibly be naruto's Uncle? i dunno but i highly doubt its anyones mama (actually...my mom does look like him...haha just kiddin) i dont have any proof to back my guess up but all were doing right now is putting our own input not bashing others ideas ^^ Everyone is entitled to their opinions ^^

Just think,,,im sure as soon as we find out, well all shit our pants ^^

omg.. u guys who even put yondaime into the picture are idiots.. pein has the rinnegan and hes not from konoha.. yondaime was borned and trained in konoha and was never shown that he could use the rinnegan or any eye technique

The 4th is Dead give it up people, Yondaime used the Reaper Death Seal on the Kyuubi to seal it in Naruto. anyone who uses it dies. furthermore anyone who is brought back by Orochimaru is under his control. AND Pein is from the Rain village not Konoha. Pein is some one from Jiraiya's past the question is: Who?